Praeclarum.Graphics.Stroke.RecognizeLoop C# (CSharp) Метод

		public bool RecognizeLoop (int startIndex, out int lastIndex)
		{
			lastIndex = startIndex;
			
			if (startIndex >= _points.Count) return false;
			
			var bb = BoundingBox;
			
			var maxDim = Math.Max (bb.Width, bb.Height);
			
			var segs = GetDirectionSegments (startIndex);
			
			if (segs.Length >= 4) {
				
				var fdir = segs [0].Direction;
				var sdir = segs [1].Direction;
				
				var ddir = sdir.Minus (fdir);
				
				if (Math.Abs (ddir) == 1) {
					
					//
					// Complete the loop
					//
					var lastSeg = 2;
					for (var i = 2; i < 4; i++) {
						
						if (segs [i].Direction.Minus (sdir) == ddir) {
							sdir = segs [i].Direction;
						}
						else {
							//
							// Is it "close enough"
							//
							var d = segs [i].StartPoint.DistanceTo (segs [0].StartPoint);
							if (d < maxDim * 0.25f) {
								break;
							}
							else {
								return false;
							}
						}
						
						lastSeg = i;
					}
					
					//
					// Allow the loop to fold in on itself
					//
					var ei = segs [lastSeg].EndIndex;
					if (lastSeg + 1 < segs.Length && segs [lastSeg + 1].Direction == fdir) {
						ei = segs [lastSeg + 1].EndIndex;
					}
					
					//
					// Trim the tail of the loop to the beginning of the loop
					//
					lastIndex = GetSegment (ei / 2, ei).GetClosestPoint (Points [0]);
					
					return true;
				}
			}

			return false;
		}